Here's what investors need to know about Tesla's earnings and 2014 guidance.

In what was one of the most anticipated earnings' releases this season, electric-vehicle maker Tesla Motors(NASDAQ:TSLA) crushed quarterly earnings' estimates and provided better than expected 2014 guidance when it released its fourth-quarter and full-year-2013 results after the market close yesterday.

Shares of Tesla soared 11% at today's open, and ended the day up 8.4% at $209.97, an all-time closing high.

Adjusted earnings were $0.33 per share, considerably higher than the $0.21 analysts had expected.

Adjusted revenue rose nearly 150% from the year-ago period to $761 million, topping the consensus estimate of $677 million.

Adjusted gross margin was 25.2%, while gross margin on a GAAP-basis was 25.8%

Vehicle deliveriesTesla delivered 6,892 Model S vehicles in the quarter, 13% higher than the 6,000 it guided for at the end of the third quarter, and 22,477 vehicles for the full year. These number didn't come as a surprise, as Tesla pre-announced them last month.

The company didn't give a breakdown by region of its vehicles delivered. However, CEO Elon Musk did state during the conference call that deliveries in the U.S. remained fairly steady from the third to the fourth quarter, so most of the increased volume came from Europe. Investors shouldn't take this to mean that demand in the U.S. has significantly slowed. Tesla needed to starve the U.S. in order to feed Europe, given that Europeans who had ordered a Model S had been waiting for a while, as Musk previously has noted.

Gross margin: goal of 25% metThis was surely one of the key numbers investors homed in on, as Musk has long stated that the company's goal was to achieve a gross margin of 25% (excluding credits for zero-emission-vehicle, or ZEV, sales) by the fourth quarter of 2013. A miss on this metric would have surely disappointed investors and likely resulted in the stock selling off.

Tesla has made steady progress in improving its gross margin, which increased from 14% in the second quarter to 21% in the third to 25.2% last quarter.

To provide some perspective, Ford's gross margin for the trailing-12-month period is 15.5%.BMW andDaimler, which make for better comparisons (at least while Tesla is still focused solely on the high-end market) sport gross margins of 19.9% and 21.5%, respectively.

So, Tesla is doing darn well on the margin front, especially considering that the auto manufacturing business is one which is notorious for its high fixed costs. Tesla's gross margin should further improve, at least slowly, as it benefits from economies of scale.

2014 guidance: clear skies on the horizonTesla expects its gross margin to reach 28% by late 2014. This target is based upon the option uptake decelerating, as Musk noted on the call. So, if folks continue to demand the many bells and whistles they've been buying, Tesla could exceed this number. It's very likely, in my opinion, that Chinese buyers will go gangbusters with options, which should help offset the likely deceleration in option uptake among U.S. buyers.

The company expects to deliver more than 35,000 vehicles in 2014, which would represent a 55% increase over 2013, and is more than the 31,000-32,000 most analysts had been forecasting.

As to production, Tesla anticipates producing about 7,400 vehicles in the first quarter, which is about a 12% sequential increase from the 6,587 it manufactured last quarter. That said, there's a planned considerable gap between this quarter's production and planned deliveries (about 6,400) due to the fact that more vehicles will be in transit for longer periods of time, as they'll be heading to international buyers. Tesla expects its production rate will ramp up to about 1,000 vehicles per week by the end of 2014, up from its current rate of about 600.

The company stated that its battery cell supply will continue to constrain its production in the first half of the year, but will improve significantly in the second half of 2014.

China and Europe outlook: rosyThe Model S is scheduled to begin shipping to China this spring. There are numerous reasons the Chinese are likely to snatch up the vehicle at a higher rate than even optimistic forecasters are predicting. That's a whole other article; suffice to say for now that Tesla's earnings release included the statement: "Already, the Beijing store is our largest and most active retail location in the world."

As for Europe, where Model S deliveries began last August, Tesla is systematically building out its Supercharger network. It started with Norway, given that Norwegians have the highest electric-vehicle ownership rate in the world, and is now focused on Germany, Europe's largest auto market, which it plans to have completely covered by the end of this year. Coverage for the rest of Western Europe is planned, as per the company's previous earnings release, as follows: "By the end of 2014, we expect that the entire population of the Netherlands, Switzerland, Belgium, Austria, Denmark and Luxembourg and about 90 percent of the population in England, Wales and Sweden will live within 320 km of a Supercharger station."

Model X launch: slight delayThe sole hiccup in Tesla's report was news its Model X crossover vehicle is now slated to launch in the spring of 2015, rather than in late 2014.

This slight delay doesn't seem like an issue, in my opinion, given Tesla had previously announced that the Model X would have only "limited availability" in late 2014 anyway. Now, a delay of a full year or more might be another matter. The concern wouldn't simply be due to the delayed launch of the X itself, but the resultant push-back effect on the launch of the more affordable third-generation model, dubbed Model E.

The mass-market third-gen vehicle is due to launch in "approximately three years," per Tesla's earnings' release. This vehicle is widely expected to be priced in the $35,000-$40,000 range.

"Giga factory" plans: expect news next weekMusk deflected most questions about the giga factory during the call, stating that Tesla will be announcing plans on this front next week.

So, we should soon be leaning more about Tesla's plans to construct a factory to produce the lithium-ion batteries it requires to greatly ramp up its production, as it will need to do for the mass-market vehicle. I'd hope for an approximate timeline, location, and partners involved to be included in that announcement.

While I'd not hold my breath about an Appleteaming on this front (as some are speculating), a big-name partner could send Tesla's stock soaring (yet again).

Foolish final thoughtsTesla had blow-out quarterly earnings, and its rosy forecast bodes well for 2014.

That said, battery supply and costs are key to Tesla's successful production and sales of its mass-market vehicle, slated to launch in approximately three years. So, substantial news about the giga factory will be just as important as Tesla's 2014 guidance for long-term investors, especially given Tesla's sky-high valuation.